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| author | Song Liu <songliubraving@fb.com> | 2015-08-13 14:31:55 -0700 |
|---|---|---|
| committer | NeilBrown <neilb@suse.com> | 2015-10-24 17:16:18 +1100 |
| commit | bac624f3f86a8c7db395c7f85ccad6a504b9c4b4 (patch) | |
| tree | 0b9240c0fb33d6adf4ddcfd85afd95321cc96552 /include/uapi | |
| parent | c4d4c91b44d8309082127893221a1971a27c50ca (diff) | |
| download | blackbird-obmc-linux-bac624f3f86a8c7db395c7f85ccad6a504b9c4b4.tar.gz blackbird-obmc-linux-bac624f3f86a8c7db395c7f85ccad6a504b9c4b4.zip | |
MD: add a new disk role to present write journal device
Next patches will use a disk as raid5/6 journaling. We need a new disk
role to present the journal device and add MD_FEATURE_JOURNAL to
feature_map for backward compability.
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: NeilBrown <neilb@suse.com>
Diffstat (limited to 'include/uapi')
| -rw-r--r-- | include/uapi/linux/raid/md_p.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/uapi/linux/raid/md_p.h b/include/uapi/linux/raid/md_p.h index d1fc8a637368..eaaab52077a3 100644 --- a/include/uapi/linux/raid/md_p.h +++ b/include/uapi/linux/raid/md_p.h @@ -89,9 +89,11 @@ * read requests will only be sent here in * dire need */ +#define MD_DISK_JOURNAL 18 /* disk is used as the write journal in RAID-5/6 */ #define MD_DISK_ROLE_SPARE 0xffff #define MD_DISK_ROLE_FAULTY 0xfffe +#define MD_DISK_ROLE_JOURNAL 0xfffd #define MD_DISK_ROLE_MAX 0xff00 /* max value of regular disk role */ typedef struct mdp_device_descriptor_s { @@ -307,6 +309,7 @@ struct mdp_superblock_1 { * is guided by bitmap. */ #define MD_FEATURE_CLUSTERED 256 /* clustered MD */ +#define MD_FEATURE_JOURNAL 512 /* support write cache */ #define MD_FEATURE_ALL (MD_FEATURE_BITMAP_OFFSET \ |MD_FEATURE_RECOVERY_OFFSET \ |MD_FEATURE_RESHAPE_ACTIVE \ |
